Almost two years ago, a shocking nine-minute video was released showing a Minneapolis police officer, Derek Chauvin, fatally kneeling on the neck of George Floyd.Mr. Chauvin is now serving a long sentence for murder.A few weeks ago, a trial began in the case of the three other officers who were on the scene that day. They are charged with violating Mr. Floyd’s civil rights during the arrest that caused his death.Guest: Kim Barker, an enterprise reporter for The New York Times.Have you lost a loved one during the pandemic? The Daily is working on a special episode memorializing those we have lost to the coronavirus. If you would like to share their name on the episode, please RECORD A VOICE MEMO and send it to us at thedaily@nytimes.com. You can find more information and specific instructions here.Background reading: The three former officers are accused of failing to intervene when they saw Mr. Chauvin using excessive force against Mr. Floyd.The case centers on a crucial issue in American policing: the duty of officers to act against colleagues when they witness misconduct.Want more from The Daily? For one big idea on the news each week from our team, subscribe to our newsletter. For more information on today’s episode, visit nytimes.com/thedaily. Transcripts of each episode will be made available by the next workday.